You are arguing over a cell phone while trailing an unmarkedpolice car by 26.0 m

Question

You are arguing over a cell phone while trailing an unmarkedpolice car by 26.0 m; both your car and the police car aretraveling at 110 km/h. Your argument diverts your attention fromthe police car for 2.0 s (long enough for you to look at the phoneand yell,“I won't do that!”). At the beginning of that2.0 s, the police officer begins braking suddenly at 6.00m/s2. (a) What is the separationbetween the two cars when your attention finally returns? Supposethat you take another 0.400 s to realize your danger and beginbraking. (b) If you too brake at 6.00m/s2, what is your speed (in km/h) when you hit thepolice car?

Explanation / Answer

You are arguing over a cell phone while trailing an unmarkedpolice car by 26.0 m; both your car and the police car aretraveling at 110 km/h. Your argument diverts your attention fromthe police car for 2.0 s (long enough for you to look at the phoneand yell,“I won't do that!”). At the beginning of that2.0 s, the police officer begins braking suddenly at 6.00m/s2. (a) What is the separationbetween the two cars when your attention finally returns?

110*5/18=30.55m/sec

distance traveled by the police car in 2 sec=30.55*2-1/2*6*4=61.11-12=49.11m+20=69.11m

distance traveled by the back side person=30.55*2=61.11m

separation=8m

similarly solve the second part of the problem

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.